<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.7.14/dist/vue.js"></script>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css" integrity="sha384-xOolHFLEh07PJGoPkLv1IbcEPTNtaed2xpHsD9ESMhqIYd0nLMwNLD69Npy4HI+N" crossorigin="anonymous">
  <style>
    .red{
      color: red;
    }
  </style>
</head>
<body>
  <div id="app">
    <div class="container">
      <!-- 顶部搜索框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody v-if="list.length>0"> 
          <tr v-for="(indx , yy) in list " :key="indx.id">
            <td>{{yy+1}}</td>
            <td>{{indx.name}}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{red: indx.price > 100}">{{indx.price}}</td>
            <td>{{dateFormate(indx.time)}}</td>
            <td><a href="#" @click="fn(indx.id)">删除</a></td>
          </tr>
          <tr style="background-color: #EEE">
            <td>统计</td>
            <td colspan="2">总价:{{zj}}</td>
            <td colspan="2">均价:{{jj}}</td>
          </tr>
        </tbody>
        <tfoot v-else>
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot>
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="资产名称"
              v-model="zc"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              type="text"
              class="form-control"
              placeholder="价格"
              v-model="jg"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button class="btn btn-primary" @click.prevent="add">添加资产</button>
      </form>
    </div>
  </div>
  <script src="https://cdn.bootcdn.net/ajax/libs/dayjs/1.11.7/dayjs.min.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        jg:'',
        zc:'',
        name: "", // 名称
        price: 0, // 价格
        list: JSON.parse(localStorage.getItem('list'))
      },
      methods: {
        fn(id){
           this.list = this.list.filter(i=> i.id!==id)
        },
        add(){
            this.list.push({
                id: +new Date(),
                name:this.zc,
                price:this.jg,
                time:new Date()
            })
            this.zc = ''
            this.jg = ''
        },
        dateFormate(val){ 
        return dayjs(val).format("YYYY-MM-DD")
        }
      },
      computed:{
        zj(){
           return this.list.reduce((i,e)=> e.price,0 )
        },
        jj(){
            return  (this.zj/this.list.length)  || 0
        }
      },
      watch: {
        list:{
            deep:true,
            handler(newValue){
                console.log('数组变化');
                localStorage.setItem('list',JSON.stringify(newValue))
            }
        }
      }
    })
  </script>
</body>
</html>